platform: nordic_nrf: Move device configuration files

Moving files to support out of tree boards.

Change-Id: I6323682dd921c1f765fe4bd27eb05d78c6d0d0d5
Signed-off-by: Vidar Lillebø <vidar.lillebo@nordicsemi.no>
diff --git a/platform/ext/target/nordic_nrf/common/nrf5340/device_cfg.h b/platform/ext/target/nordic_nrf/nrf5340dk_nrf5340_cpuapp/device_cfg.h
similarity index 100%
rename from platform/ext/target/nordic_nrf/common/nrf5340/device_cfg.h
rename to platform/ext/target/nordic_nrf/nrf5340dk_nrf5340_cpuapp/device_cfg.h
diff --git a/platform/ext/target/nordic_nrf/common/nrf9160/device_cfg.h b/platform/ext/target/nordic_nrf/nrf9160dk_nrf9160/device_cfg.h
similarity index 100%
rename from platform/ext/target/nordic_nrf/common/nrf9160/device_cfg.h
rename to platform/ext/target/nordic_nrf/nrf9160dk_nrf9160/device_cfg.h